Steam boiler



BOURG J. J. PoWER STEAM BOILER Filed Aug. 25, 1934 Nov. 17, 1936.

INVENTOR. dwf/r d Pah/.6P

ATTORNEY.

APatented Nov. 17', 1936 @UN-iran @Myf:invention-relates to a @newl and usefuliimiprovement` in avsteam boilerand9 ihas as `its obvject the fprovision'of a Iboiler Lwhich lwill ,be light, durablax compact,v economical iof 'fmanufacture Anotherobject of f the :invention isf the @provision-oflaboiler having a'centrally Vdisposed shallow "water container so that a 'veryf-shallow: depth. rof wateris Ysubjected'- to -the` gases'rising vto the top 10 'ofrthe ycombustion chamber.

An'otherf object of the-invention is `the provision Io'falboiler'fso'constructed andarranged that with amminimum -amount of lheatiexpenditure, a. maxitmum amount 'of l steam may `-be generated. 15 `(Dther objects vwill appear hereinafter.

'Theinvention-fconsists in the combination and arrangement of parts hereinafter described fand claimed.

The invention will be best understood by a reference to the accompanying drawing which forms a part of this specification and in which Fig. 1 is a central, vertical, sectional view of the invention.

Fig. 2 is a sectional View taken on line 2-2 of 25 Fig. 1.

Fig. 3 is a fragmentary sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3.

The invention comprises an outer casing or shell 9 which is covered with a layer I0 of heat insulating material. An inner shell I4 is positioned within the outer shell 9 and formed with a flange I4 which is Welded or otherwise suitably secured to the surface of the top of the outer shell 9. Positioned within the intermediate shell I4 is an inner shell I5 having a ange 22 at its lower end which is welded to the inwardly turned iiange 2| of the shell I4. The inwardly turned ,lo flange 22 on the lower end of the shell I5 rests upon the supporting structure 23 which surrounds the fire pot 24. A pipe 26 is projected through the casing 9 and the shell I4 to establish communication of the interior of the shell I5, which 45 forms the combustion chamber 25, with the at- ,mosphere The pipe 26 has a door 2'I on its outer end and this pipe 26 is also provided with a plurality of draft openings 28 which are in spaced relation and which may be brought into registra- 50 tion with the openings 30 formed in the band 29 by rotating the band 29 on the pipe 26.

'Ihe interior I6 of the shell I4 provides the water container and the space between the shell I4 and the shell I5 serves as a water leg. The

55 upper edge of the shell I5 is turned inwardly Eto. :provider-.the inwardly` proj ecting; ,1 downwardly -inclined1flangei I 1. onwhichispositioned the shallow concavecontainenl .havingthe vertically directedsllip-.IQfatritsredge. 'This shallow containerulfis in :communication 'withthe water i5 -leg I 6 :adjacent.itsbottomJby Ameans. of the `'tubes 29. The combustion chamberf25for the interior of=the shell". I5 y:is connected .by means of the tubular :stay-bolts 13 I in -communication with the lflue chamberv .32 '.withf which :communicates the 1'0 :outlet .flue I I. ".These:tubularfstayebolts 3| Vare -spaced .acircumferentially around .the shells Ill Aand I and Vin -addition;.to-binding ,these ,parts Itogether fserve :alsoasxan .outlet for the `gases xwhichLare generatedrinihe lcombustion'chamber 15 and `which travel i' in thedirection of `the l arrows -shownlzin Fig. 1. "Inorderithat, the gases may ,travelsdownwardly to4 adjacent the-bottom of the :chamber32 flhavezprovided;spacedfpartition Walls 33. Communicating with the interior of the 2O shell I4 through the top of the shell 9 is a steam outlet pipe I2 which is encased in a layer I3 of suitable insulating material. The re pot may, if desired, be provided with a grate for fuel on which coal or the like may be used. But I intend that the boiler shall be used primarily with an oil burner. The hot gases arising from the oil burner strike the bottom of the shallow container I8 and on account of the small amount of water in this container steam is very quickly generated. The tubes 20 serve to maintain the water level in the container I8 the same as the water level in the interior of the shell I4. As the gases travel upwardly toward the passages or hollow stay-bolts 3I they will of course heat, 35 to a certain extent, the inner wall I5 of the water leg and the tubes 20, but they will impinge primarily against the container I8 and elTect a maximum heating. As these hot gases travel downwardly in the chamber 32 they will still continue 40 to heat the water leg. 'Ihus the gases are brought over a large area of heating surface with the result that the stack temperature is reduced to a minimum and consequently the e'iciency of the boiler is raised to a maximum.

With a boiler constructed in this manner it becomes possible to generate steam pressure in a very short time with a minimum fuel consumption. The simplicity and economy of structure is believed obvious from the description given.

While I have illustrated and described the preferred form of construction I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such varia- 55 tions and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a boiler, an enclosing shell; an intermediate shell within said enclosing shell in spaced relation thereto, said intermediate shell being connected at its upper and lower ends to said enclosing shell; an inner shell embraced by and spaced from said intermediate shell, the lower edge of said intermediate shell being turned inwardly and connected to said inner shell to pro-- vide a water-leg positioned within and spaced from said enclosing shell; an inwardly directed, downwardly inclined, flange on the upper end of said inner shell; an open shallow pan-like structure upon said inwardly directed inclined ange and forming a closure for the top of said inner shell to provide a combustion chamber, the bottom of said pan-like structure being concave, with its convex side directed downwardly; a plurality of tubes communicating with said pan through the bottom thereof and communicating with the interior of the water-leg, the bottom of said pan being positioned normally below the water level of the boiler.

2. In a boiler, an inverted cup-shaped enclosing shell; an inwardly directed flange on the low er end of said shell; an intermediate shell positioned within and spaced from said enclosing shell and engaging at its upper end with the interior of the top of said enclosing shell and at its lower end with the upper surface of said flange; an inner cylindrical shell positioned within and spaced from said intermediate shell and engaging at its lower end an inwardly directed flange on said intermediate shell to provide therewith a water-leg; an inwardly directed inclined flange on the upper end of said inner shell; an open shallow pan-like structure having a concave bottom resting upon said inclined ange and serving as a closure for said inner shell to provide a combustion chamber, the convex face of said bottom being directed downwardly; a plurality of tubes for communicating said pan through its bottom with the interior of said water-leg, said pan being positioned downwardly from, and in spaced relation to, the top of said enclosing shell and normally below the water level of the boiler; a plurality of tubes projected through said inner shell and said intermediate shell for establishing communication between the combustion chamber and the space between said intermediate shell and said outer shell, adjacent the top thereof; and an outlet flue communicating with said space, adjacent the bottom thereof.

3. In a boiler, an enclosing shell; an intermeydiate shell within and spaced at its periphery from said enclosing shell and connected thereto at opposite ends to provide a compartment surrounding said intermediate shell; an inner shell positioned within and spaced at its periphery from said intermediate shell and connected therewith at its lower end to provide a water leg; an open shallow-pan-like structure supported on the upper end of said inner shell and forming a closure for the top of said inner shell to provide a combustion chamber, the bottom of said panlike structure being concave, with its convex side directed downwardly; and a plurality of tubes communicating with said pan through the bottom thereof and communicating with the interior -of the water leg, the bottom of said pan being positioned normally below the water level of the boiler.

JOHN J. POWER. 

